In early September 2016, Donald Trump announced his plan for a vast expansion of the U.S. military, including 90,000 new soldiers for the Army, nearly 75 new ships for the Navy, and dozens of new fighter aircraft for the Air Force. Although the cost of this increase would be substantial–about $90 billion per year–it would be covered, the GOP presidential candidate said, by cutting wasteful government spending.

But where, exactly, is the waste? In fiscal 2015, the federal government engaged in $1.1 trillion of discretionary spending, but relatively small amounts went for things like education (6 percent), veterans’ benefits (6 percent), energy and the environment (4 percent), and transportation (2 percent). The biggest item, by far, in the U.S. budget was military spending: roughly $600 billion (54 percent). If military spending were increased to $690 billion and other areas were cut to fund this increase, the military would receive roughly 63 percent of the U.S. government’s discretionary spending.

Well, you might say, maybe it’s worth it. After all, the armed forces defend the United States from enemy attack. But, in fact, the U.S. government already has far more powerful military forces than any other country. China, the world’s #2 military power, spends only about a third of what the United States does on the military. Russia spends about a ninth. There are, of course, occasional terrorist attacks within American borders. But the vast and expensive U.S. military machine–in the form of missiles, fighter planes, battleships, and bombers–is simply not effective against this kind of danger.

Furthermore, the U.S. Department of Defense certainly leads the way in wasteful behavior. As William Hartung, the director of the Arms and Security Project of the Center for International Policy, points out, “the military waste machine is running full speed ahead.” There are the helicopter gears worth $500 each purchased by the Army at $8,000 each, the $2.7 billion spent “on an air surveillance balloon that doesn’t work,” and “the accumulation of billions of dollars’ worth of weapons components that will never be used.” Private companies like Halliburton profited handsomely from Pentagon contracts for their projects in Afghanistan, such as “a multimillion-dollar `highway to nowhere,’” a $43 million gas station in nowhere, a $25 million `state of the art’ headquarters for the U.S. military in Helmand Province . . . that no one ever used, and the payment of actual salaries to countless thousands of no ones aptly labeled `ghost soldiers.’” Last year, Pro Publica created an interactive graphic revealing $17 billion in wasteful U.S. spending uncovered by the U.S. Special Inspector General for Afghan Reconstruction.

Not surprisingly, as Hartung reports, the Pentagon functions without an auditing system. Although, a quarter century ago, Congress mandated that the Pentagon audit itself, it has never managed to do so. Thus, the Defense Department doesn’t know how much equipment it has purchased, how much it has been overcharged, or how many contractors it employs. The Project on Government Oversight maintains that the Pentagon has spent about $6 billion thus far on “fixing” its audit problem. But it has done so, Hartung notes, “with no solution in sight.”

The story of the F-35 jet fighter shows how easily U.S. military spending gets out of hand. Back in 2001, when the cost of this aircraft-building program was considered astronomical, the initial estimate was $233 billion. Today, the price tag has more than quadrupled, with estimates ranging from $1.1 trillion to $1.4 trillion, making it the most expensive weapon in human history. The planes reportedly cost $135 million each, and even the pilots’ helmets run $400,000 apiece. Moreover, the planes remain unusable. Although the U.S. Marine Corps and the U.S. Air Force recently declared their versions of the F-35 combat ready, the Pentagon’s top testing official blasted that assertion in a 16-page memo, deriding them as thoroughly unsuitable for combat. The planes, he reported, had “outstanding performance deficiencies.” His assessment was reinforced in mid-September 2016, when the Air Force grounded 10 of its first F-35 fighters due to problems with their cooling lines.

U.S. wars, of course, are particularly expensive, as they require the deployment of large military forces and hardware to far-flung places, chew up very costly military equipment, and necessitate veterans’ benefits for the survivors. Taking these and other factors into account, a recent study at Brown University’s Watson Institute for International and Public Affairs put the cost to U.S. taxpayers of the U.S. wars in Iraq and Afghanistan at nearly $5 trillion thus far. According to the report’s author, Neta Crawford, this figure is “so large as to be almost incomprehensible.”

Even without war, another military expense is likely to create a U.S. budgetary crisis over the course of the next 30 years: $1 trillion for the rebuilding of the U.S. nuclear weapons complex, plus the construction of new nuclear missiles, nuclear submarines, and nuclear-armed aircraft. Aside from the vast cost, an obvious problem with this expenditure is that these weapons will either never be used or, if they are used, will destroy the world.